Industrial Light & Magic'sGo Motion Puppet Mover. External Rods
attached to various points on puppet. Rods moved by stepper motors, which
are programmed by computer. This is done single frame at at time. All this
set-up required for just ONE puppet! Complex and tedious compared to just
animating puppet by hand. (see pic below)

Above, closer photo showing external
rods attached to Wings. Entire body also attached to Huge Rig below the
puppet (see 1st photo) that moved along a track, and controlled by stepper
motors . All this effort in order to obtain Smoother frame to frame
incremental Stop Motion movements and it also added motion
blurs (camera shutter kept to create blur on film) at key frames of very
fast action/movement. Not used in Dragonslayer,there are other old school special effects methods of adding
simulated motion blurs such as smearing petroleum jelley on clear
glass placed very close to camera lens. The image distortion caused the the
petroleum jelley creates a motion blur-like streaked image on the
frame.

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Today, we have specific Stop Motion software called Frame Grabbers, to preview the frame by frame
puppet movements in order to more consistently achieve smoother animation.
Also, there are now programs that can create & add to the images,
simulated
motion blurs. This is digitally done in post production after the completion of the
animation.